Guardion will be exhibiting at the meeting, where they will display the CSV-1000 device, the global standard for contrast sensitivity testing, and have samples of Lumega-Z, the only medical food designed to restore and maintain the macular pigment.

Diabetic retinopathy causes not only vision loss, but also reduction in the components of the aging visual function system, such as contrast sensitivity, stereo acuity, and color perception, which can result in poor postural stability and a greater capacity to bump into objects, leading to a greater risk of falling," Lamoureux said by email.

Visual acuity (standard vision test) and contrast sensitivity (how well the subjects could discern differences in contrast) were measured at baseline and again at one, three, and six months into the study, while macular pigment optical density was calculated at each time point using photos of the retinas.

Psychophysical studies investigating what is known in visual perception as trellis bars--which are images of differing frequencies that demonstrate the same degree of luminance--found a contrast sensitivity function.

They also measured how the stimulus changed the speed with which the brain processed visual information and whether the stimulation also improved the subjects' contrast sensitivity -- their ability to differentiate between multiple shades of gray.

The lowest sinusoidal spatial frequency works best due to the contrast sensitivity characteristics per the Contrast Sensitivity Function (CSF) of the human eye; however the tradeoff is the amount of intrusion into the active area of the display.

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